Patent No. EP3723898 (titled "Process For Polymerizing Olefins In The Gas-Phase") was filed by Basell Polyolefine on Feb 4, 2019. The application was issued on May 5, 2021.

Patent oppositions filed by competitors challenge the validity of a granted patent. These oppositions are typically based on claims of prior art, lack of novelty, or non-obviousness. They are a key part of the process for determining a patent's strength and enforceability.
| Company | Opposition Date | Representative |
|---|---|---|
| BOREALIS | Feb 4, 2022 | KADOR & PARTNER PART MBB |
| THE DOW CHEMICAL | Feb 3, 2022 | BECK GREENER |
| WR GRACE & CONN | Feb 3, 2022 | UEXKULL & STOLBERG |
The dossier documents provide a comprehensive record of the patent's prosecution history - including filings, correspondence, and decisions made by patent offices - and are crucial for understanding the patent's legal journey and any challenges it may have faced during examination.
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